Verified Commit 716f7705 authored by Tommaso Tocci's avatar Tommaso Tocci
Browse files

intercept fseek

parent 60b39682

ifs/include/preload/passthrough.hpp

+2 −0
Original line number Diff line number Diff line
@@ -41,6 +41,8 @@ extern void* libc_fgetc; 
extern void* libc_fgets;

extern void* libc_ungetc;



extern void* libc_fseek;



extern void* libc_mkdir;

extern void* libc_mkdirat;

extern void* libc_unlink;

ifs/src/preload/intcp_functions.cpp

+16 −0
Original line number Diff line number Diff line
@@ -479,6 +479,22 @@ int ungetc(int c, FILE *stream) { 
    return LIBC_FUNC(ungetc, c, stream);

}



int fseek(FILE *stream, long offset, int whence) {

    init_passthrough_if_needed();

    if(CTX->initialized() && (stream != nullptr)) {

        auto fd = file_to_fd(stream);

        if(CTX->file_map()->exist(fd)) {

            CTX->log()->trace("{}() called [fd: {}, offset: {}, whence: {}");

            if(adafs_lseek(fd, offset, whence) == -1) {

                return -1;

            } else {

                return 0;

            }

        }

    }

    return LIBC_FUNC(fseek, stream, offset, whence);

}



/******  FILE OPS  ******/



#undef creat

ifs/src/preload/passthrough.cpp

+4 −0
Original line number Diff line number Diff line
@@ -41,6 +41,8 @@ void* libc_fgetc; 
void* libc_fgets;

void* libc_ungetc;



void* libc_fseek;



void* libc_mkdir;

void* libc_mkdirat;

void* libc_unlink;
@@ -152,6 +154,8 @@ void init_passthrough_() { 
    libc_fgets = dlsym(libc, "fgets");

    libc_ungetc = dlsym(libc, "ungetc");



    libc_fseek = dlsym(libc, "fseek");



    libc_mkdir = dlsym(libc, "mkdir");

    libc_mkdirat = dlsym(libc, "mkdirat");